Docopt

• docopt

  29 7,891 0.0 Python

  This project is no longer maintained. Please see https://github.com/jazzband/docopt-ng

  

• typer

  86 14,293 6.7 Python

  Typer, build great CLIs. Easy to code. Based on Python type hints.

These days i use typer (https://typer.tiangolo.com/), but docopt remains a fan favorite of mine for being just so darn cute.

it's a shame that the last i checked, there wasn't really a formal grammar for it and so doing a lot of the modern conveniences i like is either hard or impossible, but the idea's still charming.

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• clap-rs

  154 13,288 9.6 Rust

  A full featured, fast Command Line Argument Parser for Rust

  

I like Docopt for quick scripts, used it both in Python and Rust projects. It is quite unflexible though.

The Rust Docopt implementation¹ was deprecated this year, which is probably good because clap v3 (https://github.com/clap-rs/clap) is so awesome. In a project of mine (tealdeer), I noticed that docopt.rs was responsible for the huge majority of CPU instructions when running the binary: https://github.com/dbrgn/tealdeer/issues/106#issuecomment-59... I then switched² to clap and shaved off almost a megabyte from the release binary³. Performance improved as well, time required for rendering a tldr page went down from ~15.9 ms to ~12.4 ms⁴. With the migration, we also managed to reduce a lot of custom validation logic and move this logic into the derive macro attributes.

¹ https://github.com/docopt/docopt.rs

• tealdeer

  48 3,884 6.0 Rust

  A very fast implementation of tldr in Rust.

I like Docopt for quick scripts, used it both in Python and Rust projects. It is quite unflexible though.

The Rust Docopt implementation¹ was deprecated this year, which is probably good because clap v3 (https://github.com/clap-rs/clap) is so awesome. In a project of mine (tealdeer), I noticed that docopt.rs was responsible for the huge majority of CPU instructions when running the binary: https://github.com/dbrgn/tealdeer/issues/106#issuecomment-59... I then switched² to clap and shaved off almost a megabyte from the release binary³. Performance improved as well, time required for rendering a tldr page went down from ~15.9 ms to ~12.4 ms⁴. With the migration, we also managed to reduce a lot of custom validation logic and move this logic into the derive macro attributes.

¹ https://github.com/docopt/docopt.rs

• docopt.rs

  4 752 0.0 Rust

  Discontinued Docopt for Rust (command line argument parser).

  

I like Docopt for quick scripts, used it both in Python and Rust projects. It is quite unflexible though.

The Rust Docopt implementation¹ was deprecated this year, which is probably good because clap v3 (https://github.com/clap-rs/clap) is so awesome. In a project of mine (tealdeer), I noticed that docopt.rs was responsible for the huge majority of CPU instructions when running the binary: https://github.com/dbrgn/tealdeer/issues/106#issuecomment-59... I then switched² to clap and shaved off almost a megabyte from the release binary³. Performance improved as well, time required for rendering a tldr page went down from ~15.9 ms to ~12.4 ms⁴. With the migration, we also managed to reduce a lot of custom validation logic and move this logic into the derive macro attributes.

¹ https://github.com/docopt/docopt.rs

• cligen

  32 489 8.4 Nim

  Nim library to infer/generate command-line-interfaces / option / argument parsing; Docs at

If the PL you are using already has named parameters with defaults then you can roll a CLI on top of it with a better spcified "spec" language (the PL itself) and with less work. There are a few Python packages for this and https://github.com/c-blake/cligen

This is theoretically even possible for C++ with some kind of compile-time reflection API, but the way the C preprocessor works probably makes it hard to preserve structured comments for automatic documentation extraction. It was quite easy to do in Nim.

• docopt-ng

  5 156 4.8 Python

  Humane command line arguments parser. Now with maintenance, typehints, and complete test coverage.

  

Just FYI, the docopt package isn't updated anymore and the maintainer doesn't answer any inquiries. There are some annoying bugs one runs into when using the official docopt package. So I recommend using docopt-ng instead: https://github.com/jazzband/docopt-ng

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